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These are the clues which will lead you back to this note in the future. It is worth the time and effort to add a relevant metadata to a note as you create it whilst it is still fresh in your mind. If you have a large corpus of notes without any metadata then they might as well be written in a foreign language for all the good they will be to you. So how can you locate an item of information? It is all in the metadata, the information about information. The art of a good note taking program is providing facilities for the user to be able to locate an item within their notes even though they have forgotten almost everything about it. Things like references (links), indexes (tags) and categories have been used in computer programs to ease the location of information. Over the years librarians have come up with many tools for dealing with this problem and many of these tools have been adapted for the digital era. This is a problem which has existed for as long as there have been collections of documents. If you have a large collection of notes then there will be times when you cannot find the note which you want to find even though you know that it exists somewhere within the collection of documents.